20897012490 has 32 divisors (see below), whose sum is σ = 50156680896. Its totient is φ = 5572108800.

The previous prime is 20897012431. The next prime is 20897012491. The reversal of 20897012490 is 9421079802.

It is not an unprimeable number, because it can be changed into a prime (20897012491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 657465 + ... + 688515.

It is an arithmetic number, because the mean of its divisors is an integer number (1567396278).

Almost surely, 2^20897012490 is an apocalyptic number.

20897012490 is an abundant number, since it is smaller than the sum of its proper divisors (29259668406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20897012490 is a wasteful number, since it uses less digits than its factorization.

20897012490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53494.

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 20897012490 in words is "twenty billion, eight hundred ninety-seven million, twelve thousand, four hundred ninety".